Speaking from my architectural experience, diagramming can be immensely helpful in the design process.

Try to diagram the map in question from the top and two sides. Make multiple iteration of them and play with how your ideas fit together in that sense. Doing this by hand will be helpful in solidifying a multidimensional space in your mind. If you have any talent for drawing or feel up to exploring the diagramming process more, try to draw an axonometric / isometric diagram of your map as well.